Fig. 1From: Imputation rules for the implementation of the pre-unification education variable in the BASiD Data SetImputationsregeln für die Generierung der Bildungsvariable in den BASiD-Daten vor der WiedervereinigungDistribution of school and apprenticeship spells. (Source: BASiD 2007. Notes: The figure shows the distribution of the length of schooling (a) and apprenticeship spells (b). Schooling spells are coded as ses = 1. Apprenticeship spells are coded as ses = 2. We close interruptions of type 1 and type 3 (see Table 1) if the length of the interruption is less than or equal to six months and if the interruption is not due to a regular employment spell)Back to article page